IEC_TR_61400-21-3-2019.pdf

IEC TR 61400-21-3 Edition 1.0 2019-09 TECHNICAL REPORT Wind energy generation systems Part 21-3:Measurement and assessment of electrical characteristics Wind turbine harmonic model and its application IEC TR 61400-21-3:2019-09(en)colourinside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2019 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office Tel.:+41 22 919 02 11 3,rue de Varemb infoiec.ch CH-1211 Geneva 20 www.iec.ch Switzerland About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigendum or an amendment might have been published.IEC publications search-webstore.iec.ch/advsearchform The advanced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available online and once a month by email.IEC Customer Service Centre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance,please contact the Customer Service Centre:salesiec.ch.Electropedia-www.electropedia.org The worlds leading online dictionary on electrotechnology,containing more than 22 000 terminological entries in English and French,with equivalent terms in 16 additional languages.Also known as the International Electrotechnical Vocabulary(IEV)online.IEC Glossary-std.iec.ch/glossary 67 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries have been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC TR 61400-21-3 Edition 1.0 2019-09 TECHNICAL REPORT Wind energy generation systems Part 21-3:Measurement and assessment of electrical characteristics Wind turbine harmonic model and its application INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 27.180 ISBN 978-2-8322-7288-6 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.colourinside 2 IEC TR 61400-21-3:2019 IEC 2019 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references.8 3 Terms,definitions and abbreviations.8 3.1 Terms and definitions.8 3.2 Abbreviations.12 4 General description.13 4.1 Overview.13 4.2 Background.14 5 Recommendations of minimal requirements.17 5.1 General.17 5.2 Application.18 5.3 Input parameters.18 5.4 Harmonic model terminal.18 5.5 Output variables.19 5.6 Structure.19 6 Interfaces to other IEC documents.20 6.1 IEC 61400-21-1:2019,Annex D Harmonic evaluation.20 6.2 IEC 61400-21-1:2019,Annex E Assessment of power quality of wind turbines and wind power plants.21 7 Harmonic model.21 7.1 General.21 7.2 Thvenin/Norton equivalent circuit.22 7.3 Equivalent harmonic voltage/current sources.22 7.3.1 General.22 7.3.2 Harmonic equivalent impedance.23 7.4 Wind turbine types.24 7.4.1 General.24 7.4.2 Type 1 and Type 2.24 7.4.3 Type 3.25 7.4.4 Type 4.26 8 Validation.28 8.1 General.28 8.2 Overview.28 8.3 Model validation.29 8.4 Fictitious grid.30 9 Limitations.30 Bibliography.32 Figure 1 Example of a phase angle between the harmonic current and the harmonic voltage component as well as the fundamental voltage.9 Figure 2 Example of wind power plant typical components relevant for the harmonic studies and potential challenges in harmonic performance.14 Figure 3 Example of a WPP complex structure.15 Figure 4 Example of a WPP complex electrical infrastructure with many WTs.16 IEC TR 61400-21-3:2019 IEC 2019 3 Figure 5 Harmonic impedance estimated at the point of connection specified in Figure 4.17 Figure 6 Generic harmonic model structure represented as Norton/Thvenin equivalent circuit.20 Figure 7 Main electrical and mechanical components of Type 3 WTs 6.25 Figure 8 Example of a structure of a DFAG harmonic model(from 13).26 Figure 9 Main electrical and mechanical components of Type 4 WTs 6.26 Figure 10 Example of a converter harmonic model as Thvenin equivalent circuit together with an example of a WT power circuit(from 9).